My boyfriend and I do some online porn hunting from time to time, he likes seeing naked girls and I like seeing cute naked guys and more often than not we end up getting cute with each other we checked out some hot gifs and one gif in particular (the one shown) got my boyfriend CRAZY in pretty much an instant and needless to say we followed up our hornyness levels with each other I wanted to try and explore the sexual psychology perhaps of why this particular gif made him so hard as I have an interest in psychology and often what makes men so turned on by certain things. At first glance it would be pretty obvious why a straight man would be attracted to the image as its an attractive naked woman with big boobs exposing her vagina slowly but this image seems seemingly sexually powerful in other ways so my boyfriend says. While its subjective and some men may not find it as hot I think there are some basic psychological sexual attraction fundamentals that many (perhaps all?) straight males share on an instinctive level. My boyfriend says the main reason it is so hot is solely her movements at the very start as she is pulling her bikini bottoms through her vagina and she slightly sort of "bobs" up then down slowly in a sort of "mechanical man" manner before opening her mouth and looking up in a taunting way. The way she does the "bobbing" up and down blows his mind for some reason?! (he likes the rest too lol) Its easy for any straight guy to just say: "ITS JUST SEXY!!!!" but I hoped maybe someone could go deeper than that as to why and if there is a sort of name of this type of sexual manner and proper psychological reasoning for it. Being a woman I obviously cannot understand what a man feels and I was even hoping I could master it for him (lol) I understand this may be a strange question but I know many guys may like the gif anyway and I was curious what more may be appealing from it to men based on how she comes across. If somene doesnt feel like answering here and wants to go a little more in depth in pm then you are welcome to message and I will reply. Thx all!